MasterField:

SlaveField:
  getConfiguredMasterField(){
    return MasterField.class;
  }
  
  // variant 1 change the whole lookup call
  execChangedMasterValue(Object newValue){
    if(newValue.equals(value1)){
      setLookupCall(new LookupCall1());
    }else{
      setLookupCall(new LookupCall2());
    }
  }

  // variant 1 handle the variants in lookup calls.
  execChangedMasterValue(Object newValue){
    getLookupCall().setVariant(newValue);
  }

select value from slave_values where master_value = :master